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I have a ‘98 Rexhall Aerbus Ford 460 7.5. Replaced starter, selonoids, fuel pump, filter, fuel pressure regulator, and battery. Still won’t start. Turns over but no fire. The tank isn’t back in place because I wanted to see if it would start first. All wires, fuel lines are hooked up properly. There was fuel in the fuel pressure regulator when I removed it. Checked relays and fuses and are good. Should it start although tank is not reattached? I’m at a loss of what to try next. I’ll check Schrader valve today. Then, I’ll replace spark plugs, rotor, and distributor cap also. Is there anything else that it might be that I need to try? Any recommendations and help is highly appreciated. I also have a new battery. Since the fuel pump is in the back, I can’t hear if it hums for a few secs. I’m doing this alone an no one to assist physically. That’s a different story. It will start with a shot of starter fluid.

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    Welcome to Motor Vehicle Maintenance & Repair! If it will start with a shot of starter fluid, that's a pretty good sign it is fuel related. Your pump may not be running as you'd like. You should be able to jump it directly with a 12vdc power source directly at the pump if you want to see if it's running correctly. Next step after that is to see if there is fuel pressure at the rail. If you have pressure there, you need to see if the injectors are firing. Fuel in the regulator doesn't mean you have the right fuel pressure. – Pᴀᴜʟsᴛᴇʀ2 May 13 '18 at 21:00
  • You say it starts with starter fluid, but not without, and you don't have the fuel tank attached... At risk of sounding daft, dues it just need fuel? – Rory Alsop May 13 '18 at 21:08

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